Watermark PDF
Stamp 'Confidential', your name, or any text across every page. Private, local processing.
How to use this tool
- Drop a PDF.
- Type your watermark text.
- Style it: size, opacity, position, angle.
- Click Watermark and download.
How it works
PDF-lib draws text onto each page at the requested position and rotation, then the document is saved with the watermark embedded.
Tips
- Semi-transparent diagonal watermarks look professional and don't hide content.
- Keep it short so long text doesn't overflow page edges.
Limitations
Only text watermarks are supported (for image watermarks, overlay in an image editor first).
Frequently asked questions
Can I move the watermark?
Yes — choose position (center, top, bottom, corners) and adjust font size and opacity.
Does the watermark become part of the page?
It's drawn onto the page, so it stays visible in every viewer — it's not just metadata.
Can I watermark only some pages?
The current version stamps all pages for a consistent result.